MATLAB Answers

error in image capture

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barath V
barath V on 3 Mar 2020
Commented: barath V on 3 Mar 2020
iam getting this error always,i dont know what this error means and how to fix it?
error: Undefined function or variable 'CAMERA'.
img = im2double(getsnapshot(CAMERA)); %captures images
clc;
clear all;
CAMERA = videoinput('pointgrey', '1');%camera initialization
start(CAMERA);
a = serial('COM3','BaudRate',9600); %arduino initialization
fopen(a);
pause(1);
for a = 1:8
automate()
pause(10)
end
plot(value); %plotting values just for our visual understanding
[m,index] = max(value)
fprintf(a,'%d',index) %"here is where we send the position of image to arduino"
fclose(a)
hold on
plot(index,m,'*')
hold off
title("bodekke with spot images")
stop(CAMERA); %stop camera acquisition
function[addition] = bodekke(imagename) %bodekke function mathematics behind the autofocus detection
im = double(imread(imagename))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
end
function automate()
for i = 1:30 %to capture images
filename = sprintf('testtry%02d.jpg',i);
img = im2double(getsnapshot(CAMERA)); %captures images
img = rgb2gray(img);
imwrite(img,filename)
end
D = 'C:\Users\PRL\Desktop\just'; %location where image is stored
S = dir(fullfile(D,'*.jpg'));
for k = 1:numel(S) %applies bodekke to all images
F = fullfile(D,S(k).name);
value(k) = bodekke(F); %bodekke function call
end
end

Answers (1)

Walter Roberson
Walter Roberson on 3 Mar 2020
function automate()
need to be
function automate(CAMERA)
and your line
automate()
Needs to be
automate(CAMERA)
  1 Comment
barath V
barath V on 3 Mar 2020
hi it worked thanks,but iam having another problem now.
error: Error using imaqdevice/getsnapshot (line 65)
A timeout occurred during GETSNAPSHOT.
img = im2double(getsnapshot(CAMERA)); %captures images

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